Teleport is a must. In what way you achieve to be able to use it is your choice. How else will your reach Mepisto in a time that now other char (except when using Enigma or Amulet with Teleport charges) can reach him.
Or how else will you be the first to teleport down to Baal, or to Andariel or down to lvl5 of Countess Tower for runes?
I would recommend to get Teleport as a skill, since Telekinesis is very useful at stunning boss monsters or knocking them back, while your Merc takes them apart. This is extremely useful for bosses that are immune to your skills.
So getting it as skill is absolutly worth it.
To me at least Enigma is too expensive. But if you can easily afford it, its an option aswell, though sometimes you might want to use different gear and then suddenly you dont have Teleport anymore.
What i want to say is. Dont make your ability to Teleport item dependeant!
Those 2pts are not a waste.